Unable to detect page cache query loop issue

Hi

in site health I have this error. Do you have any idea? Many thanks
best
S

“Unable to detect page cache due to possible query loop issue. Please verify that the query loop test passes correctly. Error: Service Unavailable (code: http_503)

Using page caching improves the speed and performance of your site by serving static pages instead of generating each page from scratch each time a user visits.

The page cache is detected by looking for a possible active cache extension on the site, and also by making three requests to the home page and looking for one or more HTTP client caching response headers among the following headers:

cache-control, expires, age, last-modified, etag, x-cache-enabled, x-cache-disabled, x-srcache-store-status, x-srcache-fetch-status.”